I remember doing a physics lab at Physfak, where the result was the definition of e/m electron. I did, put in the formula with the coefficient on the method - there is a mistake on many orders. I come to the underschool (to say, it was Demidovich the younger, the son of the author of the famous textbook on Matan), showing: here, measured, set, there is a fig, and without any options, since the scale of the device is, the extreme values are understandable, and their range from the desired size is still in many orders. Demidovich looked at the device, the formula, the result, said, "Please wait" and left. He returned 15 minutes later joyfully: "I found a journal, according to which the method was prepared - there for calculation the constants took values in different systems, part in SI, part in SGSE." Therefore, he remained silent and added: "In fact, this magazine was already going to be thrown out, methodically not the first decade, and it is curious that until today all students have given this work with plausible figures."